The Challenge car chassis is built on the strong foundation of our world class Mk4 frame. Challenge Car Aluminum Panels Even vintage 1960s cars like the original ACs, Ferraris and GT-40s used proven racecar construction methods of tubular frames and riveted/bonded aluminum panels. Underneath our hand-laid fiberglass composite body are almost 40 individual aluminum panels attached to the Factory Five Mk4 spaceframe. Owing to the increased amount of steel in the Challenge car chassis, completed vehicles typically weigh around 100 lbs more than standard roadsters. The FFR 3-link suspension is the most optimized race suspension we sell, and Challenge frames come ready to use that suspension. We send along a carbon fiber cosmetic cover for this area. Additionally, the fact that the cage is welded along with the frame means that the body needs to be cut along a line from the rear cockpit opening to the back of the roll bar legs. There is no backbone section to the frame, but the full race cage contributes more than that in added rigidity. Most of the additional steel is for safety, rather than chassis rigidity. Frame mods accommodate mounting and shielding of the racing fuel cell, intrusion plates and racing seats.The chassis is about 15% more rigid than the Mk4 roadster. The differences in the frame and the tremendous amount of additional tubing mean that street car features like doors that are hinged have been replaced by NASCAR style side impact tubes. The modified roadster frame enjoys a serious cage thanks to the NASA and SCCA guidelines for open GT-1 cars. Jim is an accomplished pro roadracer in his own right, and has earned countless race wins in almost 15 years of competitive driving. The Challenge car is not just completely dominant, it’s truly the only real race car in the entire replica business.įFR Chief engineer Jim Schenck has been the steward of this car from it’s inception. No other replica can even come close to the racing hours and track wins of the FFR Challenge car design.
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